Use the following figure to answer the question. 
Based on the information provided, which of the following contains the largest source or pool of nitrogen?
Definitions:
Sustainable Growth Rate
The maximum rate at which a company can grow its earnings without needing to increase its equity or take on new debt.
Dividend Payout Ratio
The percentage of a company's earnings that is distributed to shareholders in the form of dividends.
Equity Multiplier
A financial ratio indicating how much of a company's assets are financed by shareholders' equity.
Dividend Payout Ratio
The fraction of net income a firm pays to its stockholders in dividends, expressed as a percentage of the company's total earnings.
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